NASA is investigating sabotage of a noncritical computer due to be flown to the International Space Station aboard the space shuttle Endeavour, which was cleared to lift off on August 7, the U.S. space agency said on Thursday.

A dust storm raging on Mars presents the worst threat to date to the continued operation of NASA's two rovers, threatening to starve the solar-powered robots by blocking out sunlight, NASA said on Friday.

The mysterious cosmic presence called dark energy, which is accelerating the expansion of the universe, might be lurking in hidden dimensions of space. The idea would explain how these dimensions remain stable – a big problem for the unified scheme of physics called string theory.